session 10-adaptive immunity Flashcards
1
Q
what does perforin do?
A
released by t killer cells and destroys cell walls
2
Q
when do t helper cells become active?
A
when CD4 binds to specific antigen on APC (antigen presenting cell)
-clonal selection (t helper and memory)
3
Q
what cells release perforin?
A
t killer cells
4
Q
how are b cells activated and what do they do?
A
- activated by t helpers
- release cytokines
- form plasma and memory cells
5
Q
give four features of adaptive immunity
A
- arise from MO exposure
- specific to pathogen
- enhanced by second exposure
- acquires memory
6
Q
what is the role of cytokines?
A
promotes differentiation and proliferation (rapid increase) of lymphocytes
